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Eifelian Stage — ▪ geology lowermost of the two standard worldwide divisions of Middle Devonian (Devonian Period) rocks and time. Eifelian time spans the interval between 397.5 million and 391.8 million years ago. The name of the Eifelian Stage is derived… … Universalium
eifelian — ei·fe·li·an … English syllables
eifelian — (ˈ)ī|fēlēən adjective Usage: usually capitalized Etymology: Eifel, region in western Germany + English ian : of, relating to, or constituting a subdivision of the European Devonian see geologic time table … Useful english dictionary
Marcellus Formation — Stratigraphic range: Middle Devonian … Wikipedia
Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… … Universalium
Elk Point Group — Stratigraphic range: Middle Devonian … Wikipedia
Devonian — For the Celtic language, see Southwestern Brythonic language; for the residents of the English county, see Devon. Devonian Period 416–359.2 million years ago … Wikipedia
Onychodus — Temporal range: Eifelian–Famennian … Wikipedia
Deinodus — is a form genus that includes two species: the form found in the Onondaga Formation of western New York, Deinodus bennetti, and the form found in the Columbus and Limestone of central Ohio, Deinodus ohioensis. Both species are limited to the… … Wikipedia
Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… … Wikipedia
